Method for producing substrate for liquid crystal display panel, and photomask

Abstract

The present invention provides a method for producing a substrate for a liquid crystal display panel and a photomask each of which can suppress misalignment of liquid crystal molecules due to liquid crystal alignment control projections. The present invention relates to a method for producing a substrate for a liquid crystal display panel. The substrate includes liquid crystal alignment control projections, and the liquid crystal alignment control projections include a main projection and a sub-projection. The sub-projection is linear and is lower than the main projection. The production method includes a step of forming a positive photosensitive resin film and a step of exposing the photosensitive resin film to light through a photomask. The photomask has a light-control region for forming the sub-projection. The light-control region has a slit-shaped translucent part.

1 . A method for producing a substrate for a liquid crystal display panel, the substrate comprising liquid crystal alignment control projections including a main projection and a sub-projection that is linear and is lower than the main projection,
 the method comprising:   a step of forming a positive photosensitive resin film; and   a step of exposing the photosensitive resin film to light through a photomask,   the photomask including a light-control region for forming the sub-projection, and   the light-control region including a slit-shaped translucent part.   
     
     
         2 . The method for producing a substrate for a liquid crystal display panel according to  claim 1 ,
 wherein the photomask further includes a translucent region and a light-shielding region for forming the main projection, and   the light-control region is a gray-tone region including a light-shielding part and the translucent part.   
     
     
         3 . The method for producing a substrate for a liquid crystal display panel according to  claim 2 ,
 wherein the substrate further comprises a color layer and a light-shielding layer that is higher than the color layer;   the sub-projection is a first sub-projection disposed on the color layer;   the liquid crystal alignment control projections further include a second sub-projection disposed on the light-shielding layer; and   the second sub-projection is linear and is lower than the main projection, and   wherein the gray-tone region is a first gray-tone region for forming the first sub-projection;   the light-shielding part and the translucent part are a first light-shielding part and a first translucent part, respectively;   the photomask further includes a second gray-tone region for forming the second sub-projection;   the second gray-tone region includes a second light-shielding part and a slit-shaped second translucent part; and   the second gray-tone region has a higher transmissivity than the first gray-tone region.   
     
     
         4 . The method for producing a substrate for a liquid crystal display panel according to  claim 1 ,
 wherein the substrate further comprises a columnar spacer, and   wherein the photomask further includes a translucent region, a light-shielding region for forming the columnar spacer, and a half-tone region for forming the main projection; and   the light-control region is a half-tone/gray-tone region including a partially translucent part and the translucent part.   
     
     
         5 . The method for producing a substrate for a liquid crystal display panel according to  claim 4 ,
 wherein the substrate further comprises a color layer and a light-shielding layer that is higher than the color layer;   the sub-projection is a first sub-projection that is disposed on the color layer;   the liquid crystal alignment control projections further include a second sub-projection disposed on the light-shielding layer; and   the second sub-projection is linear and is lower than the main projection, and   wherein the half-tone/gray-tone region is a first half-tone/gray-tone region for forming the first sub-projection;   the partially translucent part and the translucent part are a first partially translucent part and a first translucent part, respectively;   the photomask further includes a second half-tone/gray-tone region for forming the second sub-projection;   the second half-tone/gray-tone region includes a second partially translucent part and a slit-shaped second translucent part; and   the second half-tone/gray-tone region has a higher transmissivity than the first half-tone/gray-tone region.   
     
     
         6 . The method for producing a substrate for a liquid crystal display panel according to  claim 4 ,
 wherein the translucent part is a first translucent part;   the photomask further includes a gray-tone region; and   the gray-tone region includes a light-shielding part and a slit-shaped second translucent part.   
     
     
         7 . A photomask which is used in a process of producing a substrate for a liquid crystal display panel, the substrate comprising liquid crystal alignment control projections including a main projection and a sub-projection that is linear and is lower than the main projection,
 the photomask comprising:   a light-control region for forming the sub-projection, and   the light-control region including a slit-shaped translucent part.